powerpc: put the "zero usp means using parent's stack pointer" to copy_thread()
simplifies callers, at that... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -761,7 +761,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
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} else {
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} else {
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CHECK_FULL_REGS(regs);
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CHECK_FULL_REGS(regs);
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*childregs = *regs;
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*childregs = *regs;
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childregs->gpr[1] = usp;
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if (usp)
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childregs->gpr[1] = usp;
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p->thread.regs = childregs;
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p->thread.regs = childregs;
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childregs->gpr[3] = 0; /* Result from fork() */
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childregs->gpr[3] = 0; /* Result from fork() */
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if (clone_flags & CLONE_SETTLS) {
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if (clone_flags & CLONE_SETTLS) {
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@ -1030,8 +1031,6 @@ int sys_clone(unsigned long clone_flags, unsigned long usp,
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int __user *child_tidp, int p6,
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int __user *child_tidp, int p6,
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struct pt_regs *regs)
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struct pt_regs *regs)
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{
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{
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if (usp == 0)
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usp = regs->gpr[1]; /* stack pointer for child */
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return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
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return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
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}
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}
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@ -1039,14 +1038,14 @@ int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
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unsigned long p4, unsigned long p5, unsigned long p6,
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unsigned long p4, unsigned long p5, unsigned long p6,
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struct pt_regs *regs)
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struct pt_regs *regs)
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{
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{
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return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
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return do_fork(SIGCHLD, 0, regs, 0, NULL, NULL);
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}
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}
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int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
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int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
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unsigned long p4, unsigned long p5, unsigned long p6,
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unsigned long p4, unsigned long p5, unsigned long p6,
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struct pt_regs *regs)
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struct pt_regs *regs)
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{
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
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regs, 0, NULL, NULL);
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regs, 0, NULL, NULL);
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}
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}
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